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is a statement that has been proved on the basis of previously established statements

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moving a shape without rotating or flipping it.

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has a central point that stays fixed and everything else moves around that point in a circle.

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A transformation in which a geometric figure is reflected across a line,

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A line meeting another at a right angle, or 90° is said to be perpendicular to it.

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is a specific mathematical structure.

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is when one shape becomes exactly like another if you flip, slide or turn it.

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A linear pair is a pair of adjacent, supplementary angles.

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boundaries of possible theorems.

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A rigid motion of the plane is a motion which preserves distance.

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The set of arguments of a function corresponding to a particular subset of the range.

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parallel lines are lines in a plane which do not meet

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Three or more points are collinear

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each angular point of a polygon, polyhedron, or other figure.

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The line that divides something into two equal parts.

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Is one which is more than 90° but less than 180°

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An angle that measures less than ninety degrees but more than zero degrees.

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Two angles are supplementary when they add up to 180 degrees.

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Two angle are complementary when they add up to 90 degrees.

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is a general term for four specific ways to manipulate the shape of a point, a line, or shape.

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the exact middle point.

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the space between two intersecting lines or surfaces at or close to the point where they meet.